单项选择题

Passage Two What is mentioned as one of the suggestions raised by scientists

A．Using less insecticide.
B．Giving the plants up.
C．Spraying crops frequently.
D．Trying other insecticide.
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单项选择题
A．A college campus.B．A beautiful park.C．An art museum.D．An old building.
A．A college campus.
B．A beautiful park.
C．An art museum.
D．An old building.
单项选择题
what changes did the reinforced concrete bring to the architecture industry
A．It made the buildings solid and fireproof.
B．It decreased workers’ labor intensity.
C．It shortened the construction period.
D．It beautified the outlook of the buildings.
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